Use this transposing slide ruler to transpose music from one key to another.
Transposing can help when difficult chords are used in a song as the transposition may lead to easier fingerings.
Or if you want to play a song up or down, so it is easier to sing.

The construction of the ruler

In the middle are the degrees arranged according to the diatonic function
  I   (Tonic)
  II  (Subdominant parallel)
  III (Dominant parallel/Tonic counter parallel)
  IV  (Subdominant)
  V   (Dominant)
  VI  (Tonic parallel)
  VII  (Incomplete Dominant seventh)
Above and below are two sliding rulers with all the notes of the scale.
At the top and bottom are the resulting chords according to the rulers position.
The number between IV and V shows you the fret on which the capo has to be set
or - if the capo is already set - for how many frets the capo has to be moved.

Transposing is pretty simple:
A ruler is set for the key in which the song is present.
If the song is in 'C' before, 'C' is moved to degree 'I'.

The second ruler is set to the key in which the song is to be transposed.
If the song is to be transposed to key 'A', move 'A' of the ruler to degree 'I'


Now the second ruler shows the result:
The chords of the song are now simply replaced by the chords of the second ruler.


  • In most cases the original key results from the first or last chord of the song.
  • With a tap on a chord symbol, you switch to the 'chord' screen and see the different possible fingerings.
  • For small screens landscape mode is recommended
  • See also